/// Copyright (c) 2018 Razeware LLC
///
/// Permission is hereby granted, free of charge, to any person obtaining a copy
/// of this software and associated documentation files (the "Software"), to deal
/// in the Software without restriction, including without limitation the rights
/// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
/// copies of the Software, and to permit persons to whom the Software is
/// furnished to do so, subject to the following conditions:
///
/// The above copyright notice and this permission notice shall be included in
/// all copies or substantial portions of the Software.
///
/// Notwithstanding the foregoing, you may not use, copy, modify, merge, publish,
/// distribute, sublicense, create a derivative work, and/or sell copies of the
/// Software in any work that is designed, intended, or marketed for pedagogical or
/// instructional purposes related to programming, coding, application development,
/// or information technology.  Permission for such use, copying, modification,
/// merger, publication, distribution, sublicensing, creation of derivative works,
/// or sale is expressly withheld.
///
/// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
/// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
/// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
/// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
/// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
/// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
/// THE SOFTWARE.

import Foundation
import KooberUIKit
import PromiseKit
import KooberKit

class RideOptionSegmentButtonImageLoader {

  // MARK: - Properties
  let imageCache: ImageCache

  // MARK: - Methods
  init(imageCache: ImageCache) {
    self.imageCache = imageCache
  }

  func loadImages(using segments: [RideOptionSegmentViewModel]) -> Promise<[RideOptionSegmentViewModel]> {
    let promises = segments.map { (segment) -> Promise<RideOptionSegmentViewModel> in
      guard case let .notLoaded(normalURL, selectedURL) = segment.images else {
        return .value(segment)
      }
      return imageCache.getImagePair(at: normalURL, and: selectedURL).map { imagePair in
        var s = segment
        s.images = .loaded(normalURL: normalURL, normalImage: imagePair.image1,
                           selectedURL: selectedURL, selectedImage: imagePair.image2)
        return s
      }
    }
    return when(fulfilled: promises)
  }
}
